Bowbow- the problem w peanuts by themselves is that the item will shift around as the box drops from conveyor to conveyor at UPFedex and eventually there will be no peanuts between the item and the cardboard. If the item is really heavy, that will happen more quickly with more serious consequences. Unless the item and the peanuts are of similar density, you will have a problem. They are great in between 2 boxes or btwn a sheet of rigid foam and outer box, etc.